Enabling Ambipolar to Heavy n-Type Transport in PbS Quantum Dot Solids through Doping with Organic Molecules

Nugraha MI, Kumagai S, Watanabe S, Sytnyk M, Heiß W, Loi MA, Takeya J (2017)

Publication Status: Published

Publication Type: Journal article

Publication year: 2017

Journal

ACS Applied Materials and Interfaces American Chemical Society

Publisher: AMER CHEMICAL SOC

Book Volume: 9

Pages Range: 18039-18045

Journal Issue: 21

DOI: 10.1021/acsami.7b02867

Abstract

PbS quantum dots (QDs) are remarkable semiconducting materials, which are compatible with low-cost solution-processed electronic device fabrication. Understanding the doping of these materials is one of the great research interests, as it is a necessary step to improve the device performance as well as to enhance the applicability of this system for diverse optoelectronic applications. Here, we report the efficient doping of the PbS QD films with the use of solution-processable organic molecules. By engineering the energy levels of the donor molecules and the PbS QDs through the use of different cross-linking ligands, we are able to control the characteristics of PbS field-effect transistors (FETs) from ambipolar to strongly n-type. Because the doping promotes trap filling, the charge carrier mobility is improved up to 0.64 cm(-2) V-1 s(-1), which is the highest mobility reported for low-temperature processed PbS FETs employing SiO2 as the gate dielectric. The doping also reduces the contact resistance of the devices, which can also explain the origin of the increased mobility.

Authors with CRIS profile

Mykhailo Sytnyk Institute Materials for Electronics and Energy Technology (i-MEET) Wolfgang Heiß Professur für Werkstoffwissenschaften (lösungsprozessierte Halbleitermaterialien)

Additional Organisation(s)

Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

University of Tokyo JP Japan (JP) University of Groningen / Rijksuniversiteit Groningen NL Netherlands (NL)

How to cite

APA:

Nugraha, M.I., Kumagai, S., Watanabe, S., Sytnyk, M., Heiß, W., Loi, M.A., & Takeya, J. (2017). Enabling Ambipolar to Heavy n-Type Transport in PbS Quantum Dot Solids through Doping with Organic Molecules. ACS Applied Materials and Interfaces, 9(21), 18039-18045. https://dx.doi.org/10.1021/acsami.7b02867

MLA:

Nugraha, Mohamad Insan, et al. "Enabling Ambipolar to Heavy n-Type Transport in PbS Quantum Dot Solids through Doping with Organic Molecules." ACS Applied Materials and Interfaces 9.21 (2017): 18039-18045.

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